Figure 3.
The magnetic field strength (force between the cylindrical magnet and FF bead). (A) Color map of the magnetic field strength above the cylindrical magnet with a diameter of 10 mm and a length of 24 mm. Z is the distance from the surface of the magnet. The magnetic strength at various distances above the magnet are shown (left: Z = 2.0 mm, center: Z = 5.0 mm, right: Z = 11 mm). The correspondence between the color and force (N/bead) is shown in the color bar. (B) Log chart of the force between the cylindrical magnet and FF bead. X: Z distance, Y: log (Fabs) [log (N)/bead]. (C) The force between the cylindrical magnet and FF bead by distance from the center for several distances from the magnet. (D) Relationship between magnetic strength B (mT) and magnetic moment of a bead m (A·m2). X: applied magnetic strength B (mT), Y: magnetic moment of a bead m (A·m2). Abbreviation: FF, fluorescent ferrite.